CN1663287A - Method and system for white balancing images using facial color as a reference signal - Google Patents
Method and system for white balancing images using facial color as a reference signal Download PDFInfo
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- CN1663287A CN1663287A CN038146711A CN03814671A CN1663287A CN 1663287 A CN1663287 A CN 1663287A CN 038146711 A CN038146711 A CN 038146711A CN 03814671 A CN03814671 A CN 03814671A CN 1663287 A CN1663287 A CN 1663287A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30196—Human being; Person
- G06T2207/30201—Face
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Abstract
A system for white balancing images using facial color as a reference signal is provided. The system includes a face detector that is operable to receive a digital image and to detect a human face within the digital image. A skin tone extractor is operable to extract a skin tone from the digital image. The extracted skin tone is associated with a human face detected by the face detector. A skin tone comparator is operable to access reference skin tones and to compare the extracted skin tone to the reference skin tones in order to identify a reference skin tone corresponding to the extracted skin tone. A balance parameter generator is operable to generate a balance parameter based on the extracted skin tone and the corresponding reference skin tone. The balance parameter is operable to be applied to the digital image to white balance the digital image.
Description
The present invention relates generally to processing system for video, and in more detail, relate to a kind of method and system that uses face color to come the white balance image as the reference signal.
From the color in digital camera or portable video camera or the image that on the monitor of video screen or personal computer, shows because a variety of causes presents difference through being everlasting between each image.In order between each image, to keep constant coloured appearance, often use the technology that is called white balance.Use this technology, with the white in the imaging scene as a reference, make whole scene carry out the color adjustment according to this white.
The white balance of traditional digital picture provides by manual and automated manner.For manual white balance, imaging device is typically aimed at supposition reference surface for white under white illumination.For Automatic white balance, usually there is the bright spot in white object and the general white object correspondence image in supposition in the imaging scene.Use the white object of supposition to carry out white balance then as reference.But, when white object in fact not in the imaging scene or bright spot when not belonging to the white surface of reference, this technology can be adjusted image with leading to errors.
According to the present invention, provide a kind of face color of using to come the method and system of white balance image as the reference signal, eliminate basically or reduced shortcoming and the problem relevant with legacy system and method.Especially, can replace white object end user face to provide Automatic white balance as color reference, the scene that makes white object wherein not have to occur can be by color adjustment correctly.
According to one embodiment of the present of invention, provide a kind of face color of using to come the system of white balance image as the reference signal, this system comprises face detector, skin tone extractor, a plurality of reference skin tones, skin tone comparator and balance parameter generator.Face detector is used to receive digital picture and detects the interior people's face of digital picture.Skin tone extractor is used to extract all constant face color model to each race.Skin tone extractor connects face detector.Skin tone extractor is used for extracting the colour of skin from digital picture.The colour of skin of extracting is related with people's face that face detector detects.Skin tone comparator connects skin tone extractor.Skin tone comparator is used to visit the colour of skin and the reference skin tones of reference skin tones and relatively extraction, so that identification is corresponding to the reference skin tones of extracting the colour of skin.The balance parameters generator connects skin tone comparator.The balance parameters generator is used for producing balance parameters according to the colour of skin of extracting and the corresponding reference colour of skin.Balance parameters is applied to digital picture and comes the white balance digital picture.
According to another embodiment of the present invention, provide a kind of method of using face color to come the white balance image as the reference signal.This method comprises the white balance input signal of reception from digital picture.Carry out the relevant judgement that whether in input signal, detects people's face.When in input signal, detecting face, extract the colour of skin of the face of detecting.The colour of skin and a plurality of reference skin tones extracted are relatively discerned the corresponding reference colour of skin.Produce balance parameters according to the colour of skin of extracting and the corresponding reference colour of skin.
The technological merit of one or more embodiment of the present invention comprises the method that improved Automatic white balance image is provided.In certain embodiments, with respect to white object, people's face is used as color reference in the imaging scene.As a result, wherein the white object scene that do not have to occur can be according to people's face by color adjustment correctly.
Other technological merit will easily be found out by those skilled in the art from the following drawings, explanation and claim.
Before being elaborated, the definition that proposes some word and expression use in whole this patent document is favourable: term " comprises " and " comprising " and derivative thereof mean and comprise rather than limit; Term " or " included, mean and/or; Phrase " association " and " related with it " and derivative thereof can mean and comprise, be comprised, connect, comprise, involved, be connected to or link to each other, be coupled or be coupled, communicate by letter, cooperate, insert and put, approaching, adjacent or adjacent to, have, have, have characteristic or the like; And term " controller " means any device, system or its part of controlling at least one operation, and such device can be at hardware, firmware or software or at least wherein realized in certain combination of two.Should illustrate that the function related with any specific controller can be centralized or distributed, no matter be this locality or remote control.Especially, controller can comprise one or more data processors and related input/output device and memory, carries out one or more application programs and/or operating system program.To providing in whole this patent document of being defined in of certain words and phrase, it should be understood by one skilled in the art that this defines priority application in many (if not most examples), and use also like this future of the word and expression of definition like this.
For the more fully understanding of the present invention and advantage thereof, with reference now to the explanation below in conjunction with respective drawings, wherein identical reference number is represented identical part, wherein:
Fig. 1 is that explanation is used for using face color that the block diagram of video camera of the white balance of image is provided as the reference signal according to one embodiment of the present of invention;
Fig. 2 A is that explanation is used for using face color that the block diagram of computer generated image system of the white balance of image is provided as the reference signal according to one embodiment of the present of invention;
To be explanation by the computer generated image system of Fig. 2 A make Fig. 2 B is used for providing as the reference signal with face color according to one embodiment of the present of invention the block diagram of white balance application of the white balance of image; With
Fig. 3 is that explanation is used the flow chart of face color as the white balance method of the image of reference signal according to one embodiment of the present of invention in the computer generated image system of the video camera of Fig. 1 or Fig. 2.
Fig. 1 that discusses below-3 and being used for illustrates each embodiment only explanation and the scope that should not be construed as limiting the invention by any way as an example of the principle of the invention of this patent document.In with the lower part, the present invention will illustrate in three embodiment: digital camera, digital television and computer generated image system.But this only is used for should not be construed as by any way for example limiting the scope of the invention.It will be appreciated by those skilled in the art that principle of the present invention can implement in the image processing system of any suitable configuration.
Fig. 1 is that explanation is used for using face color that the block diagram of video camera 100 of the white balance of image is provided as the reference signal according to one embodiment of the present of invention.Video camera 100 can comprise that digital camera, digital portable video camera or any other are used for the video camera of the suitable type of processing digital images.
Video camera 100 comprises imageing sensor 102, analog to digital converter 104, image processor 106 and white balance module 110.Imageing sensor 102 is used to receive the incident image 120 based on the light of the scene reflectivity that writes down from video camera 100 location.Imageing sensor 102 also is used for producing analog signal 122 and analog signal 122 being offered analog to digital converter 104 from incident image 120.
Analog to digital converter 104 is used to receive analog signal 122 and is used for image processor 106 from analog signal 122 generation digital signals 124.Image processor 106 is used for receiving digital signals 124 and digital signal 124 is carried out additional treatments producing displayable image 126.Displayable image 126 can record in video camera 100 in the storage device 128, for example compact flash cards, intelligent multimedia card, memory stick etc., and/or can offer external system and come record.
Analog to digital converter 104 also is used for producing digital incoming frame 130 from analog signal 122 and is used for white balance module 110, and image processor 106 is used for from white balance module 110 receiving balance parameters 132, and balance parameters 132 is applied to displayable image 126, so that white balance displayable image 126.
White balance module 110 comprises face detector 140, skin tone extractor 142, skin tone comparator 144, balance parameters generator 146 and reference skin tones 148.According to an embodiment, white balance module 110 may be incorporated in the automatic gain parts (not shown in figure 1) of full luminance that is used for adjusting the image of being caught by video camera 100 of video camera 100.
Face detector 140 is used to receive at least one incoming frame 130 from analog to digital converter 104, and judges in the incoming frame 130 people's face whether occurs.Face detector 140 can be carried out this judgement according to face detection algorithms or any suitable process that other is used to detect the people's face in the digital picture based on brightness.
If face detector 140 detects people's face in incoming frame 130, then face detector 140 also is used to skin tone extractor 142 to produce the face signal 150 that detects.The face signal 150 that detects can comprise from incoming frame 130 data corresponding with the face of detecting, be used to discern coordinate or other finger URL or any other appropriate signals of the position of the faces of detections in the incoming frame 130.
Skin tone extractor 142 is used to extract all constant face color model to each race.Skin tone extractor 142 is used to receive the face signal 150 of detection, and extracts the colour of skin that detects face according to the face signal 150 that detects.Skin tone extractor 142 also is used to skin tone comparator 144 to produce the skin tone signal of extracting 152.The skin tone signal of extracting 152 can comprise that identification detects the data of the extraction colour of skin of face.
Skin tone comparator 144 is used to receive the skin tone signal 152 of extraction, and relatively by the extraction colour of skin of skin tone signal 152 identifications of extracting with as a plurality of colours of skin with reference to the colour of skin 148 storages.Skin tone comparator 144 also is used for according to extracting the colour of skin and the corresponding reference colour of skin 148 thereof, for balance parameters generator 146 produces comparison signal 154.
The corresponding reference colour of skin 148 comprises such reference skin tones 148, it comprises the true colour of skin that presents as it in normal illumination, and extract the colour of skin comprise as it be shown as 102 that catch by the imageing sensor of video camera 100, because the colour of skin that actual illumination presents when not having the displayable image 126 of white balance.Comparison signal 154 can comprise that data or any other of the difference between data, the identification extraction colour of skin and the corresponding reference colour of skin 148 of the identification extraction colour of skin and the corresponding reference colour of skin 148 are used to make balance parameters generator 146 can produce the proper data of balance parameters 132.
Balance parameters generator 146 is used to receive comparison signal 154, and is that image processor 106 produces balance parameters 132 according to comparison signal 154.According to an embodiment, by reference signal is replaced with reference skin tones from reference white color, balance parameters generator 146 can be used for according to U.S. Patent No. 6,069, and disclosed principle produces balance parameters 132 in 972.Balance parameters 132 can should be used for the displayable image 126 that white balance produces by image processor 106 by image processor 106.
Though face detector 140, skin tone extractor 142, skin tone comparator 144, balance parameters generator 146 and reference skin tones 148 illustrate and are described as resolution element, but be appreciated that any or all these elements 140,142,144,146 and/or 148 can not depart from the scope of the present invention and are implemented in together.In addition, reference skin tones 148 can provide outside white balance module 110.For example, can be stored in can be from the medium that video camera 100 is removed for reference skin tones 148.
In addition, any or all face detector 140, skin tone extractor 142, skin tone comparator 144 and balance parameter generator 146 can comprise the logic that is coded in the medium.This logic comprises the function command of program tasks.This medium comprises computer disks or other computer-readable medium, application-specific integrated circuit (ASIC), field programmable gate array, digital signal processor, other suitable special use or general processor, transmission medium or codified and utilize other suitable medium of logic therein.
Fig. 2 A is that explanation is used for using face color that the block diagram of computer generated image system 300 of the white balance of image is provided as the reference signal according to one embodiment of the present of invention.According to an embodiment, computer generated image system 300 comprises personal computer 302, display 304, optional loud speaker 306 and at least one input unit, for example keyboard 308 and/or pointing device 310.
Be described in more detail as following, CPU 324 is used to call white balance module so that correctly adjust the color of the object that occurs on the screen 340.White balance module is in conjunction with the work that should be used for of any generation vision signal that other is carried out in personal computer 302, and for example the RF TV signal of fluidisation Video Applications, MPEG or AVI player, reception and demodulation input is with video card of producing baseband video signal or the like.According to one embodiment of the present of invention, the white balance module of being carried out by CPU 324 can be stored among 332,3.5 inches moveable magnetic disc (not shown in figure 1)s of CD-ROM, the RAM 326 or any other suitable position.Therefore, for an embodiment, RAM 326 can be used for storage operating system program, fluidisation video application, MPEG/AVI player application and white balance module.
To be explanation by computer generated image system 300 make Fig. 2 B is used for using face color that the block diagram of white balance module 350 of the white balance of image is provided as the reference signal according to one embodiment of the present of invention.White balance module 350 is used to receive the incoming frame 352 from being presented at the vision signal on the display 304 by computer 302, and produces balance parameters 354 according to incoming frame 352.White balance module 350 comprises face detector 360, skin tone extractor 362, skin tone comparator 364, balance parameters generator 366 and reference skin tones 368.
If face detector 360 detects people's face in incoming frame 352, then face detector 360 also is used to skin tone extractor 362 to produce the face signal 370 that detects.The face signal 370 that detects can comprise with from the corresponding data of incoming frame 352 and the face of detecting, be used to discern coordinate or other finger URL or any other appropriate signals of the face positions of incoming frame 352 interior detections.
The corresponding reference colour of skin 368 comprises such reference skin tones 368, and it comprises the true colour of skin that presents as it in normal illumination, comprises the colour of skin that presents as it and extract the colour of skin when not having white balance to show by display 304.Comparison signal 374 can comprise that data or any other of the difference between data, the identification extraction colour of skin and the corresponding reference colour of skin 368 of the identification extraction colour of skin and the corresponding reference colour of skin 368 are used to make balance parameters generator 366 can produce the proper data of balance parameters 364.
Though face detector 360, skin tone extractor 362, skin tone comparator 364, balance parameters generator 366 and reference skin tones 368 illustrate and are described as resolution element, but be appreciated that any or all these elements 360,362,364,366 and/or 368 can not depart from the scope of the present invention and are implemented in together.In addition, reference skin tones 368 can provide outside white balance module 35 0.For example, reference skin tones 368 can be stored in can be from the medium that computer 302 is removed, in RAM 326 or other the suitable position, and the remainder of white balance module 350 provides elsewhere.
In addition, any or all face detector 360, skin tone extractor 362, skin tone comparator 364 and balance parameter generator 366 can comprise the logic that is coded in the medium.This logic comprises the function command of program tasks.This medium comprises computer disks and other computer-readable medium, application-specific integrated circuit (ASIC), field programmable gate array, digital signal processor, other suitable special use or general processor, transmission medium or codified and utilize other suitable medium of logic therein.
Fig. 3 is that explanation is used the flow chart of face color as the white balance method of the image of reference signal according to one embodiment of the present of invention in video camera 100, computer generated image system 3 00 or any other suitable imaging system.This method wherein receives white balance input signal 130,352 from digital picture in step 400 beginning.In step 402, attempt detecting the people's face in the input signal 130,352.
In decision steps 404, carry out the relevant judgement that whether in input signal 130,352, detects face.If in input signal 130,352, do not detect face, method along branch not from decision steps 404 to step 406.In step 406, can selectively carry out any suitable alternative white balance process, afterwards, this method finishes.
Get back to decision steps 404, if in input signal 130,352, detect face, method along be branch from decision steps 404 to step 408.In step 408, extract the colour of skin of the face of detecting.In step 410, the colour of skin of extraction and reference skin tones 148,368 compare with the identification corresponding reference colour of skin 148,368.
In step 414, produce balance parameters 132,354 according to the colour of skin of extracting and the corresponding reference colour of skin 148,368.In step 416, balance parameters 132,354 is applied to digital picture, so that the white balance digital picture.In step 418, can show digital picture through white balance, this method finishes afterwards.
Like this, when the balance parameters 132,354 according to the colour of skin of extracting and 148,368 generations of the corresponding reference colour of skin is applied to whole digital picture, for the color that digital picture shows can all be proofreaied and correct.By this way, can come the whole digital picture of white balance according to the colour of skin of the people's face in the digital picture of using corresponding reference skin tones 148,368 to proofread and correct.
Though the present invention has been described, can have made those skilled in the art expect variations and modifications with several embodiment.Promptly the present invention includes this interior variation and the modification of scope that falls into claims.
Claims (20)
1. one kind is used face color to come the system of white balance image as the reference signal, comprising:
Face detector (140) is used to receive digital picture and detects the interior people's face of digital picture;
Be connected to the skin tone extractor (142) of face detector (140), this skin tone extractor (142) is used for extracting the colour of skin from digital picture, and the colour of skin of extraction is related with the people's face that is detected by face detector (140);
A plurality of reference skin tones (148);
Be connected to the skin tone comparator (144) of skin tone extractor (142), this skin tone comparator (144) is used to visit the colour of skin and the reference skin tones (148) of reference skin tones (148) and relatively extraction, so that identification is corresponding to the reference skin tones (148) of extracting the colour of skin; With
Be connected to the balance parameters generator (146) of skin tone comparator (144), this balance parameters generator (146) is used for producing balance parameters (132) according to the colour of skin of extracting and the corresponding reference colour of skin (148), and balance parameters (132) is applied to digital picture and comes the white balance digital picture.
2. system as claimed in claim 1, described face detector (140) are used for according to the people's face that detects based on the face detection algorithms of brightness in the digital picture.
3. system as claimed in claim 1, described face detector (140) are that skin tone extractor (142) produces the face signal (150) that detects when being used for detecting face in digital picture.
4. system as claimed in claim 3, the face signal of described detection (150) comprise from the data corresponding to the digital picture of the face of detecting.
5. system as claimed in claim 3, the face signal of described detection (150) comprise the finger URL of the position of the face that is used for the detection in the discriminating digit image.
6. it is that skin tone comparator (144) produces the skin tone signal of extracting (152) that system as claimed in claim 1, described skin tone extractor (142) are used for according to the colour of skin of extracting, and the skin tone signal of extraction (152) comprises the data of the colour of skin of identification extraction.
7. system as claimed in claim 1, described skin tone comparator (144) are used to balance parameters generator (146) to produce comparison signal (154), and comparison signal (154) comprises the colour of skin of identification extraction and the data of the corresponding reference colour of skin (148).
8. system as claimed in claim 1, described skin tone comparator (144) are used to balance parameters generator (146) to produce comparison signal (154), and comparison signal (154) comprises the colour of skin of identification extraction and the data of the difference between the corresponding reference colour of skin (148).
9. one kind is used face color as the method that the reference signal comes the white balance image, comprising:
Reception is from the white balance input signal (130) of digital picture;
Judge and whether in input signal (130), detect people's face;
When in input signal (130), detecting face, extract the colour of skin of the face of detecting;
Relatively the colour of skin of Ti Quing and a plurality of reference skin tones (148) are with the identification corresponding reference colour of skin (148); With
Produce balance parameters (132) according to the colour of skin of extracting and the corresponding reference colour of skin (148).
10. method as claimed in claim 9 further comprises balance parameters (132) is applied to digital picture so that the white balance digital picture.
11. method as claimed in claim 9 further comprises the digital picture of demonstration through white balance.
12. method as claimed in claim 9 further comprises and carry out the white balance process that substitutes when not detecting face in input signal (130).
13. method as claimed in claim 9 further comprises producing the face signal that detects when detecting face in digital picture (130).
14. method as claimed in claim 9 judges that whether detecting people's face in input signal (130) is included in the last face detection algorithms of carrying out based on brightness of input signal (130).
15. one kind is used face color to come the system of white balance image as the reference signal, comprising:
The accessible medium of computer; With
Be stored in the logic on the accessible medium of computer, this logic is used to receive the white balance input signal (130) from digital picture, judge and whether in input signal (130), detect people's face, when in input signal (130), detecting face, extract the colour of skin of the face of detecting, relatively the colour of skin of Ti Quing and a plurality of reference skin tones (148) produce balance parameters (132) with the identification corresponding reference colour of skin (148) with according to the colour of skin of extracting and the corresponding reference colour of skin (148).
16. as the system of claim 15, described logic is further used for balance parameters (132) is applied to digital picture so that the white balance digital picture.
17. as the system of claim 15, described logic is further used for showing the digital picture through white balance.
18. as the system of claim 15, described logic is further used for carrying out the white balance process that substitutes when not detecting face in input signal (130).
19. as the system of claim 15, described logic is further used for producing the face signal that detects when detecting face in input signal (130).
20. as the system of claim 15, described logic is used for by going up to carry out to judge whether detect people's face at input signal (130) based on the face detection algorithms of brightness at input signal (130).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/179,360 US6975759B2 (en) | 2002-06-25 | 2002-06-25 | Method and system for white balancing images using facial color as a reference signal |
| US10/179360 | 2002-06-25 |
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| CN1663287A true CN1663287A (en) | 2005-08-31 |
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| CN038146711A Pending CN1663287A (en) | 2002-06-25 | 2003-06-16 | Method and system for white balancing images using facial color as a reference signal |
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|---|---|
| US (1) | US6975759B2 (en) |
| EP (1) | EP1518417A1 (en) |
| JP (1) | JP4219893B2 (en) |
| KR (1) | KR100981697B1 (en) |
| CN (1) | CN1663287A (en) |
| AU (1) | AU2003237013A1 (en) |
| WO (1) | WO2004002166A1 (en) |
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Also Published As
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|---|---|
| KR20050016880A (en) | 2005-02-21 |
| JP2005531189A (en) | 2005-10-13 |
| AU2003237013A1 (en) | 2004-01-06 |
| US6975759B2 (en) | 2005-12-13 |
| KR100981697B1 (en) | 2010-09-13 |
| JP4219893B2 (en) | 2009-02-04 |
| WO2004002166A1 (en) | 2003-12-31 |
| US20030235333A1 (en) | 2003-12-25 |
| EP1518417A1 (en) | 2005-03-30 |
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